From 7b02207537d35bfa1714bf8beafc921f717d100a Mon Sep 17 00:00:00 2001
From: 单军华
Date: Wed, 11 Jul 2018 10:47:42 +0800
Subject: [PATCH] 首次上传
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+[](https://www.versioneye.com/objective-c/reachability/references)
+
+# Reachability
+
+This is a drop-in replacement for Apple's `Reachability` class. It is ARC-compatible, and it uses the new GCD methods to notify of network interface changes.
+
+In addition to the standard `NSNotification`, it supports the use of blocks for when the network becomes reachable and unreachable.
+
+Finally, you can specify whether a WWAN connection is considered "reachable".
+
+*DO NOT OPEN BUGS UNTIL YOU HAVE TESTED ON DEVICE*
+
+## Requirements
+
+Once you have added the `.h/m` files to your project, simply:
+
+* Go to the `Project->TARGETS->Build Phases->Link Binary With Libraries`.
+* Press the plus in the lower left of the list.
+* Add `SystemConfiguration.framework`.
+
+Boom, you're done.
+
+## Examples
+
+### Block Example
+
+This sample uses blocks to notify when the interface state has changed. The blocks will be called on a **BACKGROUND THREAD**, so you need to dispatch UI updates onto the main thread.
+
+ // Allocate a reachability object
+ Reachability* reach = [Reachability reachabilityWithHostname:@"www.google.com"];
+
+ // Set the blocks
+ reach.reachableBlock = ^(Reachability*reach)
+ {
+ // keep in mind this is called on a background thread
+ // and if you are updating the UI it needs to happen
+ // on the main thread, like this:
+
+ dispatch_async(dispatch_get_main_queue(), ^{
+ NSLog(@"REACHABLE!");
+ });
+ };
+
+ reach.unreachableBlock = ^(Reachability*reach)
+ {
+ NSLog(@"UNREACHABLE!");
+ };
+
+ // Start the notifier, which will cause the reachability object to retain itself!
+ [reach startNotifier];
+
+### `NSNotification` Example
+
+This sample will use `NSNotification`s to notify when the interface has changed. They will be delivered on the **MAIN THREAD**, so you *can* do UI updates from within the function.
+
+In addition, it asks the `Reachability` object to consider the WWAN (3G/EDGE/CDMA) as a non-reachable connection (you might use this if you are writing a video streaming app, for example, to save the user's data plan).
+
+ // Allocate a reachability object
+ Reachability* reach = [Reachability reachabilityWithHostname:@"www.google.com"];
+
+ // Tell the reachability that we DON'T want to be reachable on 3G/EDGE/CDMA
+ reach.reachableOnWWAN = NO;
+
+ // Here we set up a NSNotification observer. The Reachability that caused the notification
+ // is passed in the object parameter
+ [[NSNotificationCenter defaultCenter] addObserver:self
+ selector:@selector(reachabilityChanged:)
+ name:kReachabilityChangedNotification
+ object:nil];
+
+ [reach startNotifier];
+
+## Tell the world
+
+Head over to [Projects using Reachability](https://github.com/tonymillion/Reachability/wiki/Projects-using-Reachability) and add your project for "Maximum Wins!".
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